Teflon double-wall corrugated pipe production equipment and preparation method thereof

Abstract

The invention discloses teflon double-wall corrugated pipe production equipment and a preparation method thereof. The production equipment comprises an extruder, a machine head, a cutting machine, a forming machine, cooling equipment and a polyethylene adhesive storage tank, an inner wall flow channel and an outer wall flow channel are formed in the machine head, the inner wall flow channel is communicated with the HDPE and Teflon mixed raw material extrusion barrel, the outer wall flow channel is communicated with the HDPE extrusion barrel, the tail end of the inner wall flow channel is communicated with an inner wall extrusion opening, and the tail end of the outer wall flow channel is communicated with an outer wall extrusion opening. An adhesive runner is formed between the inner wall runner and the outer wall runner, and the tail end of the adhesive runner is communicated with an adhesive extrusion port. The adhesive runner is additionally arranged between the inner wall runner and the outer wall runner of the extruder, an adhesive in the polyethylene adhesive storage tank is conveyed into the adhesive runner through the discharging valve and is finally extruded out through the adhesive extrusion opening, and the adhesive can be used for more tightly bonding an HDPE and Teflon mixed raw material and an HDPE raw material; the problem that the inner wall and the outer wall are prone to layering in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of double-wall corrugated pipe technology, specifically a Teflon double-wall corrugated pipe production equipment and its preparation method. Background Technology

[0002] Double-wall corrugated pipe is a new type of pipe with a corrugated outer wall and a smooth inner wall. Currently, most double-wall corrugated pipes are made of high-density polyethylene (HDPE). HDPE has excellent chemical stability, aging resistance, and resistance to environmental stress cracking. Current HDPE double-wall corrugated pipes consist of an inner wall and an outer wall, both made of the same material. The corrugated outer wall and a smooth inner wall are simultaneously extruded from HDPE and fused together in a single process. The pipe wall has a double-layer structure; the inner wall is smooth and flat, while the outer wall has a trapezoidal hollow structure with equally spaced rectangular ribs.

[0003] Because it is made of a single material, the performance of the pipe is greatly limited, and its applicability in some special fields is low. Therefore, in order to improve the practicality of double-wall corrugated pipes, many manufacturers modify the formula by adding different materials to the raw materials to improve their performance. However, since the main components remain unchanged, it is difficult to improve the performance of the pipe, which leads to the current limitation of the performance of double-wall corrugated pipes.

[0004] Currently, some chemical plants use double-wall corrugated pipes to transport chemical waste liquids. However, we have found that the inner wall of these pipes has poor corrosion resistance, leading to internal corrosion and affecting their service life. To address this issue, Chinese invention patent application CN201911032538.X discloses a reinforced HDPE double-wall corrugated pipe and its preparation method. By using an immersion rotary sprayer to coat the inner wall of the corrugated pipe with Teflon coating, the inner pipe is protected from all strong acids (including aqua regia), strong oxidants, reducing agents, and various organic solvents (except sodium hydroxide at temperatures above 300°C). This protects the inner pipe from any type of chemical corrosion, and almost no substances adhere to the polytetrafluoroethylene coating, thus improving the fluidity of the liquid inside the pipe. While this solution effectively addresses chemical corrosion, during production, the material composition of the inner and outer walls of the double-wall corrugated pipe changes, resulting in poor adhesion between the inner and outer walls and a tendency for delamination. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a Teflon double-wall corrugated pipe production equipment and its preparation method. A novel double-wall corrugated pipe is manufactured using HDPE and a mixture of HDPE and Teflon raw materials. By adding an adhesive channel between the inner and outer walls of the existing extruder, and by delivering polyethylene adhesive to the adhesive channel through a polyethylene adhesive storage tank, the adhesion between the inner and outer walls is increased, solving the problem of delamination between the inner and outer walls that is common in existing technologies.

[0007] (II) Technical Solution

[0008] To address the above problems, the present invention provides the following technical solution:

[0009] The first objective of this invention is to provide a Teflon double-wall corrugated pipe production equipment, including an extruder, a die head, a cutting machine, a molding machine, a cooling device, and a polyethylene adhesive storage tank; the die head has an inner wall flow channel and an outer wall flow channel inside, the inner wall flow channel is connected to the extrusion cylinder of the HDPE and Teflon mixed raw materials, the outer wall flow channel is connected to the HDPE extrusion cylinder, the end of the inner wall flow channel is connected to the inner wall extrusion port, the end of the outer wall flow channel is connected to the outer wall extrusion port, and an adhesive flow channel is formed between the inner wall flow channel and the outer wall flow channel, the end of the adhesive flow channel is connected to the adhesive extrusion port.

[0010] Preferably, the inlet of the adhesive channel is connected to a discharge valve, and the discharge valve is connected to a polyethylene adhesive storage tank. During the production process, the adhesive inside the polyethylene adhesive storage tank is transported to the inside of the adhesive channel through the discharge valve and finally extruded through the adhesive extrusion port. The adhesive can bond the HDPE and Teflon mixed raw materials and the HDPE raw materials more tightly, solving the problem of delamination between the inner and outer walls in the prior art.

[0011] Preferably, the extruder is equipped with an outer flow channel and an inner flow channel for plasticizing raw materials and conveying the plasticized raw materials to the die head. The extruder includes a drive device, the output shaft of which is connected to a transmission device. Two sets of transmission boxes are provided on the right side of the transmission device. An extrusion cylinder is fixedly installed at the right end of each of the two transmission boxes. The ends of the two extrusion cylinders are connected through an extrusion sleeve. The end of the extrusion sleeve connects to the outer flow channel and the inner flow channel of the die head. A heating sleeve is provided on the extrusion cylinder, and a feeding device is provided at the feed inlet on the upper side of the extrusion cylinder.

[0012] Preferably, the transmission device includes a drive gear disk rotatably connected inside the transmission device. The drive gear disk is powered by a drive device. A gear belt meshes on the surface of the drive gear disk, and a driven gear disk meshes at the upper end of the gear belt. A drive shaft is fixedly installed in the middle of the driven gear disk and rotatably connected inside the transmission device. A drive gear is fixedly installed at the right end of the drive shaft, located to the right of the driven gear disk. Driven gears mesh on both sides of the drive gear. A rotating shaft is fixedly installed on the driven gear. The right end of the rotating shaft passes through the transmission device to the inside of the transmission box. A screw is installed inside the extrusion cylinder, and the end of the rotating shaft is fixedly installed with the screw. By using one drive device to drive two extrusion cylinders to extrude different materials, the utilization rate of the drive device can be improved, solving the problem of low equipment utilization in traditional double-wall corrugated pipe production lines that require two extruders for extrusion operations. At the same time, it can reduce the equipment footprint and improve the equipment's high-intensity production capacity.

[0013] Preferably, the molding machine is composed of upper and lower groups. The interior of the molding machine includes an output shaft, a transmission belt meshing on the output shaft, and several molding modules arranged on the transmission belt. The interior of each molding module has an exhaust port. A molding sleeve is arranged between the upper and lower molding machines, and the end of the molding sleeve is connected to the end of the machine head.

[0014] Preferably, the cooling device includes a cooling box, a support column at the bottom of the cooling box, water spray pipes on the upper and lower sides inside the cooling device, a double-walled corrugated pipe between the water spray pipes, a nozzle on the inner side of the water spray pipe, a water pump connected to the inlet of the water spray pipe, the water pump being connected to a cold water pipe, and a drain valve at the bottom of the cooling box connected to a drain pipe.

[0015] The double-wall corrugated pipe produced by the Teflon double-wall corrugated pipe production equipment of the present invention consists of an outer wall and an inner wall, which are bonded together. The inner wall is smooth, while the outer wall is corrugated. The space between the corrugations of the outer and inner walls is hollow. In this embodiment, the outer wall is made of HDPE material, and the inner wall is made of a mixture of HDPE and Teflon. The outer and inner walls are bonded together with an adhesive.

[0016] The second objective of this invention is to provide a method for manufacturing a Teflon double-wall corrugated pipe. This method is implemented based on the Teflon double-wall corrugated pipe production equipment provided in the first objective, and the specific manufacturing steps are as follows:

[0017] S1. First, prepare the production materials for the inner and outer walls required for production, namely HDPE and Teflon mixed raw materials and HDPE raw materials, and then pour them into different feeding devices respectively.

[0018] S2, then the HDPE and Teflon mixed raw materials and HDPE raw materials are heated separately through different heating jackets, and plasticized according to their plasticizing temperature. After plasticization, the HDPE and Teflon mixed raw materials are extruded through the extruder and flow into the inner wall channel.

[0019] S3, In step S2, after the HDPE raw material is plasticized, it is extruded through an extruder and flows into the interior of the outer wall channel;

[0020] S4. While S2 and S3 are in operation, the discharge valve at the bottom of the polyethylene adhesive storage tank is opened, and the adhesive inside the polyethylene adhesive storage tank flows into the adhesive flow channel, which can bond the outer wall and inner wall of the double-wall corrugated pipe during the forming process.

[0021] S5, the inner and outer walls of the double-wall corrugated pipe are extruded through the die head, and the extruded material is then processed by the forming machine;

[0022] S6, the formed double-wall corrugated pipe is transported to the cooling equipment for cooling treatment;

[0023] S7. After cooling, the double-wall corrugated pipe is cut by a cutting machine. The cut double-wall corrugated pipe is then stored to complete the preparation of the entire double-wall corrugated pipe.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the present invention provides a Teflon double-wall corrugated pipe production equipment and its preparation method, which has the following beneficial effects:

[0026] 1. The present invention relates to a Teflon double-wall corrugated pipe production equipment and its preparation method. HDPE and Teflon mixed raw materials are conveyed to the inner wall channel via an extruder and finally extruded through the inner wall extrusion port. HDPE raw materials are conveyed to the outer wall channel via an extruder and finally extruded through the outer wall extrusion port. During the production process, adhesive from the polyethylene adhesive storage tank is conveyed to the adhesive channel via a discharge valve and finally extruded through the adhesive extrusion port. The adhesive can bond the HDPE and Teflon mixed raw materials and the HDPE raw materials more tightly, solving the problem of delamination between the inner and outer walls in the prior art.

[0027] 2. The present invention relates to a Teflon double-wall corrugated pipe production equipment and its preparation method, which uses a driving device to drive two extrusion cylinders to extrude different materials. This can improve the utilization rate of the driving device, solve the problem of low equipment utilization in traditional double-wall corrugated pipe production lines that require two extruders for extrusion operations, and at the same time reduce the equipment footprint and improve the equipment's high-intensity production.

[0028] 3. The present invention relates to a Teflon double-wall corrugated pipe production equipment and its preparation method, which produces a new type of double-wall corrugated pipe by using HDPE and HDPE and Teflon mixed raw materials. By changing the composition of the inner and outer wall materials, it can simultaneously possess the excellent properties of HDPE and HDPE and Teflon mixed raw materials, making it suitable for different material conveying operations and improving the practicality of double-wall corrugated pipes. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the double-wall corrugated pipe production equipment of the present invention;

[0030] Figure 2 This is a schematic diagram of the extruder in this invention;

[0031] Figure 3 This is a schematic diagram of the structure of the extruder extrusion cylinder in this invention;

[0032] Figure 4 This is a schematic diagram of the extruder gear transmission box in this invention;

[0033] Figure 5 This is a schematic diagram of the extruder head in this invention;

[0034] Figure 6 This is a schematic diagram of the molding equipment in this invention;

[0035] Figure 7 This is a schematic diagram of the cooling device in this invention;

[0036] Figure 8 This is a schematic diagram of the structure of the double-walled corrugated pipe prepared according to the present invention;

[0037] Figure 9 This is a schematic diagram of the inner and outer walls of the double-walled corrugated pipe prepared according to the present invention.

[0038] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A in the middle.

[0039] In the diagram: 1. Double-walled corrugated pipe; 3. Outer wall; 4. Inner wall; 5. Extruder; 11. Feeding device; 12. Heating jacket; 13. Extrusion cylinder; 14. Drive device; 15. Transmission device; 16. Extrusion sleeve; 151. Transmission box; 152. Driven gear disc; 153. Transmission shaft; 154. Rotating shaft; 155. Driven gear; 156. Gear belt; 157. Driven gear disc; 158. Driven gear; 6. Die head; 61. Inner wall flow channel; 62. Outer wall flow channel; 63. Discharge valve; 64. Adhesive flow channel; 65. Outer wall extrusion port; 66. Adhesive extrusion port; 67. Inner wall extrusion port; 7. Cutting machine; 8. Molding machine; 81. Molding module; 82. Molding sleeve; 83. Exhaust port; 84. Transmission belt; 85. Output shaft; 9. Cooling equipment; 91. Support column; 92. Drain valve; 93. Water pump; 94. Water spray pipe; 95. Nozzle; 96. Cooling box; 10. Polyethylene adhesive storage tank. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Please see Figures 1-4 This invention provides a new technical solution: a Teflon double-wall corrugated pipe production equipment, including an extruder 5, a die head 6, a cutting machine 7, a molding machine 8, a cooling device 9, and a polyethylene adhesive storage tank 10; the extruder 5 is equipped with an outer flow channel and an inner flow channel for plasticizing raw materials and conveying the plasticized raw materials to the die head 6; the extruder 5 includes a drive device 14, which is fixed to the ground foundation by a mounting base; the output shaft of the drive device 14 is connected to a transmission device 15; two sets of transmission boxes 151 are provided on the right side of the transmission device 15; an extrusion cylinder 13 is fixedly installed at the right end of each of the two transmission boxes 151; the ends of the two extrusion cylinders 13 are connected by an extrusion sleeve 16; the end of the extrusion sleeve 16 connects to the outer flow channel and the inner flow channel of the die head 6; a heating sleeve 12 is provided on the extrusion cylinder 13 for heating and plasticizing the material inside the extrusion cylinder 13; and a feeding device 11 is provided at the feed inlet on the upper side of the extrusion cylinder 13.

[0043] In this embodiment, the transmission device 15 includes a drive gear disk 157, which is rotatably connected inside the transmission device 15. The drive gear disk 157 is powered by a drive device 14. A gear belt 156 meshes with the surface of the drive gear disk 157, and a driven gear disk 152 meshes with the upper end of the gear belt 156. The drive gear disk 157 drives the driven gear disk 152 to rotate synchronously via the gear belt 156. A drive shaft 153 is fixedly mounted in the middle of the driven gear disk 152. The drive shaft 153 is located within the transmission device. The transmission shaft 153 is internally rotatably connected to the drive shaft 153. A drive gear 158 is fixedly installed on the right end of the drive shaft 153. The drive gear 158 is located on the right side of the driven gear disk 152. The driven gear disk 152 drives the drive gear 158 to rotate synchronously. Driven gears 155 are meshed on both sides of the drive gear 158. A rotating shaft 154 is fixedly installed on the driven gear 155. The right end of the rotating shaft 154 passes through the transmission device 15 to the inside of the transmission box 151. A screw is provided inside the extrusion cylinder 13. The end of the rotating shaft 154 is fixedly installed with the screw.

[0044] In practical use, when it is necessary to plasticize and extrude HDPE and Teflon mixed raw materials and HDPE materials, the HDPE and Teflon mixed raw materials and HDPE materials are first placed into different feeding devices 11, and then conveyed to the extrusion cylinder 13 through the feeding devices 11. Then, the heating jacket 12 is controlled by the control system to heat and plasticize the materials inside the extrusion cylinder 13 separately. Then, the drive device 14 is started, which drives the drive gear disk 157 to rotate, and then drives the driven gear disk 152 to rotate through the gear belt 156. The drive gear 158 is driven to rotate synchronously through the transmission shaft 153, and then drives the two driven gears 155 to rotate. Then, the driven gears 155 drive the rotating shaft 154 to rotate inside the transmission box 151. The end of the rotating shaft 154 is connected to the screw inside the extrusion cylinder 13, so that the materials inside the different extrusion cylinders 13 can be conveyed and extruded separately. Finally, the different materials are conveyed to the outer flow channel and inner flow channel of the die head 6 through the extrusion sleeve 16.

[0045] In this embodiment, a driving device 14 drives two extrusion cylinders 13 to extrude different materials, which can improve the utilization rate of the driving device 14 and solve the problem of low equipment utilization rate in traditional double-wall corrugated pipe production lines that require two extruders for extrusion operations. At the same time, it can reduce the equipment footprint and improve the equipment's high-intensity production.

[0046] Please see Figure 5The Teflon double-wall corrugated pipe production equipment described above produces double-wall corrugated pipes with the same structure as those in Embodiment 1. The equipment includes a die head 6. The die head 6 has an inner wall flow channel 61 and an outer wall flow channel 62. The inner wall flow channel 61 is connected to an extrusion cylinder 13 for the HDPE and Teflon mixed raw materials. The outer wall flow channel 62 is connected to the HDPE extrusion cylinder 13. An inner wall extrusion port 67 is connected to the end of the inner wall flow channel 61, and an outer wall extrusion port 65 is connected to the end of the outer wall flow channel 62. An adhesive flow channel 64 is provided between the inner wall flow channel 61 and the outer wall flow channel 62, and the end of the adhesive flow channel 64 is connected to an adhesive extrusion port 66.

[0047] In this embodiment, the inlet of the adhesive channel 64 is connected to a discharge valve 63, and the discharge valve 63 is connected to a polyethylene adhesive storage tank 10.

[0048] In this embodiment, the outer wall extrusion port 65, the adhesive extrusion port 66, and the inner wall extrusion port 67 are arranged in an arc shape, and the ends of the outer wall extrusion port 65, the adhesive extrusion port 66, and the inner wall extrusion port 67 are close to each other, which can make the material contact more tightly.

[0049] In the specific implementation process, the HDPE and Teflon mixed raw materials are first transported to the inner wall flow channel 61 through the extruder and finally extruded through the inner wall extrusion port 67. The HDPE raw material is transported to the outer wall flow channel 62 through the extruder and finally extruded through the outer wall extrusion port 65. During the production process, the adhesive inside the polyethylene adhesive storage tank 10 is transported to the adhesive flow channel 64 through the discharge valve 63 and finally extruded through the adhesive extrusion port 66. The adhesive can make the HDPE and Teflon mixed raw materials and the HDPE raw material bond more tightly and avoid delamination.

[0050] Please see Figure 6 The Teflon double-wall corrugated pipe production equipment described above produces double-wall corrugated pipes with the same structure as those in Embodiment 1. The equipment includes a forming machine 8, which is divided into upper and lower sections. The forming machine 8 has an output shaft 85 inside, and a transmission belt 84 meshes with the output shaft 85. Several forming modules 81 are arranged on the transmission belt 84. The forming modules 81 on the upper and lower forming machines 8 are in contact and are circular in shape. Each forming module 81 has an exhaust port 83 inside, and the exhaust ports 83 on different forming modules 81 are connected. A vacuum pump is used to evacuate the interior of the exhaust ports 83. A forming sleeve 82 is arranged between the upper and lower forming machines 8, and the end of the forming sleeve 82 is connected to the end of the machine head 6.

[0051] In the specific implementation process, the extruder plasticizes the raw material and conveys the plasticized raw material to the inner and outer flow channels. The cylindrical preform extruded from the inner flow channel is sized by the forming sleeve 82 to form the inner wall 4 of the double-wall corrugated pipe 1. The cylindrical preform extruded from the outer flow channel is adsorbed onto the inner wall of the two forming modules 81 by the outer vacuum system of the two forming modules 81. The outer wall 3 of the double-wall corrugated pipe 1 is formed by injection molding through the two forming modules 81. At the same time, the two forming modules 81 press the inner wall 4 and the outer wall 3 of the double-wall corrugated pipe 1 together to form the double-wall corrugated pipe 1. The output shaft 85 is driven to rotate by an external motor, which in turn drives the transmission belt 84 to rotate, which in turn drives the forming modules 81 to rotate synchronously, which can drive the double-wall corrugated pipe 1 to move forward.

[0052] Please see Figure 7 The Teflon double-wall corrugated pipe production equipment described above produces double-wall corrugated pipes with the same structure as those in Embodiment 1. The equipment includes a cooling device 9, which comprises a cooling tank 96. A support column 91 is provided at the bottom of the cooling tank 96. Water spray pipes 94 are arranged on the upper and lower sides inside the cooling device 9. The double-wall corrugated pipe 1 is positioned between the water spray pipes 94. A nozzle 95 is provided on the inner side of each water spray pipe 94. A water pump 93 is connected to the inlet of each water spray pipe 94. Pump 93 is connected to a cold water pipe. A drain valve 92 is provided at the bottom of the cooling box 96, and the drain valve 92 is connected to a drain pipe. In actual use, the double-wall corrugated pipe 1 is transported into the cooling box 96. The water pump 93 is started to transport cooling water into the spray pipe 94. The cooling water can be sprayed out through the nozzle 95 to cool the surface of the double-wall corrugated pipe 1. The cooled double-wall corrugated pipe 1 is then transported to the cutting machine 7, where it is cut. The cut double-wall corrugated pipe 1 is then stored.

[0053] Example 2

[0054] Please see Figures 8-10 The double-wall corrugated pipe 1 produced by the Teflon double-wall corrugated pipe production equipment of the present invention is composed of an outer wall 3 and an inner wall 4. The outer wall 3 and the inner wall 4 are bonded together. The inner wall 4 is smooth and the outer wall 3 is corrugated. The space between the corrugations of the outer wall 3 and the inner wall 4 is hollow.

[0055] In this embodiment, the outer wall 3 is made of HDPE material, and the inner wall 4 is made of a mixture of HDPE and Teflon. The outer wall 3 and the inner wall 4 are bonded together with an adhesive, thus possessing the advantages of both HDPE and the HDPE / Teflon mixture. The HDPE / Teflon mixture of the inner wall 4 is composed of the following raw materials by weight percentage: 15 parts polytetrafluoroethylene, 70 parts modified high-density polyethylene granules, 9 parts plasticizer, 5 parts reinforcing filler, 1 part titanate coupling agent, 0.5 parts dispersant, 0.3 parts heat stabilizer, and 0.2 parts lubricant. The HDPE material of the outer wall 3 is composed of the following raw materials by weight percentage: 80 parts modified high-density polyethylene granules, 9 parts plasticizer, 5 parts reinforcing filler, 1 part titanate coupling agent, 0.5 parts dispersant, 0.3 parts heat stabilizer, and 0.2 parts lubricant.

[0056] In this embodiment, to ensure the adhesion between the inner wall 4 and the outer wall 3, one part of titanate coupling agent is added to the raw material composition of the outer wall 3 and the inner wall 4 respectively to enhance the adhesion between the outer wall 3 and the inner wall 4.

[0057] In this embodiment, to ensure the toughness of the inner wall 4 and the outer wall 3, the plasticizer includes one or more of phthalate esters, polybenzoate esters, benzoic acid esters, polyol esters, chlorinated hydrocarbons, epoxy resins, citrate esters, and polyesters. By adding plasticizers to the components of the inner wall 4 and the outer wall 3 respectively, the performance of the polymer material can be improved, production costs can be reduced, production efficiency can be increased, and the toughness of the double-wall corrugated pipe can be guaranteed.

[0058] In this embodiment, to ensure the strength and wear resistance of the inner wall 4 and the outer wall 3, the reinforcing filler includes one or more of talc, calcium carbonate, mica powder, kaolin, wollastonite, and barium sulfate; by adding reinforcing fillers to the components of the inner wall 4 and the outer wall 3 respectively, the high pressure resistance and wear resistance of the double-wall corrugated pipe are significantly improved.

[0059] In this embodiment, the dispersant includes one or more of white oil, polytetrafluoroethylene powder, polyethylene wax, oxidized polyethylene wax, and polypropylene wax; it can uniformly disperse solid and liquid particles of organic pigments, while also preventing particle sedimentation and agglomeration.

[0060] In this embodiment, the heat stabilizer includes one or a mixture of more than one of calcium stearate, dibutyltin dilaurate, lead tribasic sulfate, zinc 2-ethylhexanoate, triphenyl phosphite, and phenyl diisooctyl phosphite.

[0061] In this embodiment, the lubricant includes one or a mixture of more than one of ethylene bis-stearamide, silicone powder, modified ethylene bis-stearamide, and pentaerythritol stearate.

[0062] This embodiment describes a novel double-wall corrugated pipe made from HDPE and a mixture of HDPE and Teflon. The outer wall 3, made of HDPE, exhibits excellent chemical stability, aging resistance, and resistance to environmental stress cracking, making it suitable for use in various environments. The outer wall 3 has a ring-shaped corrugated structure, which greatly enhances the pipe's ring stiffness, thereby increasing its resistance to soil load. In this respect, the HDPE double-wall corrugated pipe has a significant advantage over other pipe materials. The inner wall 4, made of a mixture of HDPE and Teflon, offers advantages such as acid and alkali resistance, salt spray resistance, corrosion resistance, good flexibility, and resistance to high and low temperature impacts, making it suitable for conveying various materials and improving the practicality of the corrugated pipe.

[0063] Example 3

[0064] This invention also includes a method for preparing a Teflon double-wall corrugated pipe. This method is implemented using the aforementioned Teflon double-wall corrugated pipe production equipment, and the specific manufacturing steps are as follows:

[0065] S1. First, prepare the production materials for the inner wall 4 and outer wall 3 required for production, namely HDPE and Teflon mixed raw materials and HDPE raw materials, and then pour them into the different feeding devices 11 respectively.

[0066] S2, then the HDPE and Teflon mixed raw materials and HDPE raw materials are heated separately by different heating jackets 12, and plasticized according to their plasticizing temperature. After plasticization, the HDPE and Teflon mixed raw materials are extruded by the extruder and flow into the inner wall channel 61.

[0067] S3, In the previous step, the HDPE raw material was plasticized, extruded by an extruder, and flowed into the interior of 62;

[0068] S4. While S2 and S3 are in operation, the discharge valve at the bottom of the polyethylene adhesive storage tank 10 is opened, and the adhesive inside the polyethylene adhesive storage tank 10 flows into the adhesive flow channel 64, which can bond the outer wall 3 and inner wall 4 of the double-wall corrugated pipe 1 during the molding process.

[0069] S5, the inner and outer walls of the double-wall corrugated pipe 1 are extruded through the die head 6, and the extruded material is processed by the forming machine 8.

[0070] S6, the formed double-wall corrugated pipe 1 is transported to the cooling equipment 9 for cooling treatment;

[0071] S7, the cooled double-wall corrugated pipe 1 is cut by the cutting machine 7, and the cut double-wall corrugated pipe 1 is stored to complete the preparation of the entire double-wall corrugated pipe 1.

[0072] The Teflon double-wall corrugated pipe manufacturing method provided in this embodiment of the invention can realize all the processes of the above embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A Teflon double-wall corrugated pipe production equipment, comprising an extruder (5), a die head (6), a cutter (7), a molding machine (8), a cooling device (9), and a polyethylene adhesive storage tank (10), characterized in that: The die head (6) has an inner wall flow channel (61) and an outer wall flow channel (62) inside. The inner wall flow channel (61) is connected to the HDPE and Teflon mixed raw material extrusion cylinder (13). The outer wall flow channel (62) is connected to the HDPE extrusion cylinder (13). The end of the inner wall flow channel (61) is connected to the inner wall extrusion port (67). The end of the outer wall flow channel (62) is connected to the outer wall extrusion port (65). An adhesive flow channel (64) is provided between the inner wall flow channel (61) and the outer wall flow channel (62). The end of the adhesive flow channel (64) is connected to the head adhesive extrusion port (66).

2. The Teflon double-wall corrugated pipe production equipment according to claim 1, characterized in that: The inlet of the adhesive channel (64) is connected to a discharge valve (63), and the discharge valve (63) is connected to a polyethylene adhesive storage tank (10).

3. The Teflon double-wall corrugated pipe production equipment according to claim 1, characterized in that: The extruder (5) is provided with an outer flow channel and an inner flow channel for plasticizing raw materials and conveying the plasticized raw materials to the die head (6). The extruder (5) includes a drive device (14). The output shaft of the drive device (14) is connected to a transmission device (15). Two sets of transmission boxes (151) are provided on the right side of the transmission device (15). Extrusion cylinders (13) are fixedly installed at the right ends of the two transmission boxes (151). The ends of the two extrusion cylinders (13) are connected through an extrusion sleeve (16). The end of the extrusion sleeve (16) is connected to the outer flow channel and the inner flow channel of the die head (6). A heating jacket (12) is provided on the extrusion cylinder (13). A feeding device (11) is provided at the feed port on the upper side of the extrusion cylinder (13).

4. The Teflon double-wall corrugated pipe production equipment according to claim 3, characterized in that: The transmission device (15) includes a drive gear disk (157) inside, which is rotatably connected inside the transmission device (15). The drive gear disk (157) is powered by a drive device (14). A gear belt (156) meshes with the surface of the drive gear disk (157). A driven gear disk (152) meshes with the upper end of the gear belt (156). A drive shaft (153) is fixedly installed in the middle of the driven gear disk (152). The drive shaft (153) rotates inside the transmission device (15). The drive shaft (153) is connected to a drive gear (158) fixedly mounted on the right end. The drive gear (158) is located on the right side of the driven gear disk (152). Drive gears (155) mesh on both sides of the drive gear (158). A rotating shaft (154) is fixedly mounted on the driven gear (155). The right end of the rotating shaft (154) passes through the transmission device (15) to the inside of the transmission box (151). A screw is provided inside the extrusion cylinder (13). The end of the rotating shaft (154) is fixedly mounted to the screw.

5. The Teflon double-wall corrugated pipe production equipment according to claim 1, characterized in that: The molding machine (8) is composed of two groups, upper and lower. The interior of the molding machine (8) includes an output shaft (85), a transmission belt (84) meshes on the output shaft (85), and several molding modules (81) are arranged on the transmission belt (84). An exhaust port (83) is opened inside the molding module (81). A molding sleeve (82) is arranged between the upper and lower molding machines (8), and the end of the molding sleeve (82) is connected to the end of the machine head (6).

6. The Teflon double-wall corrugated pipe production equipment according to claim 1, characterized in that: The cooling device (9) includes a cooling box (96), a support column (91) is provided at the bottom of the cooling box (96), water spray pipes (94) are provided on the upper and lower sides inside the cooling device (9), a double-wall corrugated pipe (1) is provided between the water spray pipes (94), a nozzle (95) is provided on the inner side of the water spray pipes (94), a water pump (93) is connected to the water inlet of the water spray pipes (94), the water pump (93) is connected to the cold water pipe, and a drain valve (92) is provided at the bottom of the cooling box (96), the drain valve (92) is connected to a drain pipe.

7. A method for preparing a Teflon double-wall corrugated pipe, wherein the method is implemented based on the Teflon double-wall corrugated pipe production equipment according to any one of claims 1-6, characterized in that: The preparation method includes the following steps when implemented: S1. First, prepare the production materials for the inner and outer walls of the double-wall corrugated pipes required for production, namely HDPE and Teflon mixed raw materials and HDPE raw materials, and then pour them into the different feeding devices (11). S2, then the HDPE and HDPE and Teflon mixed raw materials are heated separately by different heating jackets (12) and plasticized according to their plasticizing temperature. After plasticization, the HDPE and Teflon mixed raw materials are extruded by the extruder and flow into the inner wall channel (61). S3, In step S2, after the HDPE raw material is plasticized, it is extruded by an extruder and flows into the interior of the outer wall channel (62); S4. While working in steps S2 and S3, open the discharge valve at the bottom of the polyethylene adhesive storage tank (10). The adhesive inside the polyethylene adhesive storage tank (10) flows into the adhesive flow channel (64), which can bond the outer wall and inner wall of the double-wall corrugated pipe during the forming process. S5, the inner and outer walls of the double-wall corrugated pipe are extruded through the die head (6), and the extruded raw material is processed by the molding machine (8); S6, the formed double-wall corrugated pipe is transported to the cooling equipment (9) for cooling treatment; S7, the cooled double-wall corrugated pipe is cut by a cutting machine (7), and the cut double-wall corrugated pipe is stored to complete the preparation of the entire double-wall corrugated pipe.

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